#version 100
precision mediump float;    
attribute  vec2 a_position;  
attribute  vec2 a_texCoord;  
varying   vec2 v_texCoord;    
void main()                 
{                           
   gl_Position = vec4(a_position.xy,0.0,1.0);
   v_texCoord = a_texCoord;  
}                           